Objective-C ,ios,iphone開發基礎:快速實現一個簡單的圖片查看器
新建一個single view 工程：
關閉ARC , 在.xib視圖文件上拖放一個UIImageView 兩個UIButton ，一個UISlider ，布局如圖。
并為他們連線，
UIImageView 和 UISlider 分別定義插座變量，兩個 UIButton 分別 連接兩個Action next和previous ，在為 UISlider 連接一個Action 事件。
再在.h 文件中聲明兩個實例變量。 NSInteger index ; NSMutableArray* arrayPic ; 一個用來記錄當前圖片的index，一個用來做圖片的容器，
用UISlider 來控制圖片的透明度 （alpha 屬性）。在slider 的界面構建起動作中添加代碼，讓圖片的透明度等于 slider的value。
- (IBAction)sliderChangeValued:(id)sender {
self.imageView.alpha = slider.value;
}</pre>在兩個UIButton 的界面構建起動作中添加代碼，循環遍歷arrayPic中的圖片：</div>
- (IBAction)next:(id)sender {
if(index == [arrayPic count]){
index = 0;
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index++;
}- (IBAction)previous:(id)sender {
if(index == -1){
index = ([arrayPic count] -1);
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index--;
}
至此：簡單的圖片查看器已經完成，
整個控制器類中的代碼：
// // wsqViewController.h// picLook// // Created by administrator on 13-9-5.// Copyright (c) 2013年 MyCompanyName. All rights reserved.// #import <UIKit/UIKit.h>@interface wsqViewController : UIViewController {
UIImageView imageView;
UISlider slider;
NSInteger index ;
NSMutableArray* arrayPic ;
}
@property (retain, nonatomic) IBOutlet UIImageView imageView;
@property (retain, nonatomic) IBOutlet UISlider slider;- (IBAction)sliderChangeValued:(id)sender;- (IBAction)next:(id)sender;- (IBAction)previous:(id)sender;@end</pre></div>
//
// wsqViewController.m
// picLook
//
// Created by administrator on 13-9-5.
// Copyright (c) 2013年 __MyCompanyName__. All rights reserved.
//
#import "wsqViewController.h"
@implementation wsqViewController
@synthesize imageView;
@synthesize slider;
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
//獲取mainbudle下所有 jpg格式的圖片，
arrayPic = [[NSMutableArray alloc ] initWithArray: [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil]];
index = 0;
NSLog(@"%@",arrayPic);
}
- (void)viewDidUnload
{
[self setImageView:nil];
[self setSlider:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void)dealloc {
[arrayPic release];
[imageView release];
[slider release];
[super dealloc];
}
- (IBAction)sliderChangeValued:(id)sender {
self.imageView.alpha = slider.value;
}
- (IBAction)next:(id)sender {
if(index == [arrayPic count]){
index = 0;
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index++;
}
- (IBAction)previous:(id)sender {
if(index == -1){
index = ([arrayPic count] -1);
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index--;
}
@end
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